Explaining the Decline in Subjective Well-Being Over Time in Panel Data

Abstract

Switzerland reached the top five countries which have the highest rate of subjective well-being (SWB), which converges with the economic prosperity and high quality of life in this country. Based on transversal data (European Social Survey), SWB measured through a global question remained globally constant over the last decades. However, SWB declined between 2000 and 2015 when measured with longitudinal data (Swiss Household Panel, SHP). In this context, the aim of this contribution is to examine to what extent the decline in SWB in longitudinal data is a robust result showing an actual decrease or reflect some specific methodological artifacts of these data. We identified more precisely four possible methodological issues: non-random attrition (NRA), panel conditioning (PC), refreshment sample, and aging of participants. Because of its structure, SHP data are particularly appropriate to challenge these issues, with a special attention to panel conditioning on several measures of SWB (i.e., global question vs. questions by life domains). SHP has been administered annually since 1999. A first sample was randomly selected in 1999, a second sample in 2004, and a third sample in 2013. First, we found that attrition was selective in the predictors of SWB all along the waves and that the respondents leaving the panel were more frequently represented in modalities of predictors associated with lower SWB. Second, panel conditioning was found to affect SWB measure in the first five waves for the global question and no specific patterns for questions by life domains were found. Third, we found higher SWB mean score in new samples than in old ones. And fourth, we found that aging modified the characteristics of the sample—for example, an increase of inactive persons or a decrease of persons with a low education affected the levels of SWB. Thus, SWB and its determinants were affected by NRA, PC, refreshment, and aging. Moreover, it has to be noted that it was difficult or impossible to distinguish these methodological issues from one another—aging from PC or refreshment from PC for example—as well as to propose methodological “remedies” to them. Finally, it resulted from our research that once these methodological issues have been neutralized, SWB did not decline anymore over the last fifteen years in Switzerland.